As noted above, your body may compensate for a dry mouth by producing more saliva. “Many antidepressants, some bladder-control medications, and antihistamines such as diphenhydramine, found in Benadryl and some nighttime ‘PM’ products, can dry out the mouth,” he said. “Too little saliva can lead to bad breath, mouth irritation, cavities, and oral yeast infections.”
Article source: https://www.huffingtonpost.co.uk/entry/dribbling-sleep-health_uk_6ae32ce7e4b0a2cccd4694b2